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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Full view of a private partial view cannot be a subtype
Date: Tue, 5 Dec 2017 14:16:48 -0600
Organization: JSA Research & Innovation
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Xref: reader02.eternal-september.org comp.lang.ada:49384
Date: 2017-12-05T14:16:48-06:00
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"Jeffrey R. Carter" <spam.jrcarter.not@spam.not.acm.org> wrote in message 
news:p04frg$q8n$1@dont-email.me...
...
> Perhaps the best fit of any problem with type extension is a GUI 
> framework, since everything "is-a" widget. I have used 2 such frameworks 
> implemented using type extension, Claw and Gnoga, and both are very 
> difficult to understand. The derivation trees are very deep and there are 
> a huge number of inherited operations. It's effectively impossible to know 
> all the operations for the most commonly used types, which tend to be down 
> at the leaves of the derivation tree.

Not impossible, just impossible by reading the source code. The Claw 
documentation materializes all of the inherited routines so that there is a 
cohesive list of all of the operations available for each time in the 
documentation. (Needless to say, this documentation is generated by an 
automated tool with annotations.)

...
> Sometimes an operation behaves differently at different levels, with no 
> indication that this should be expected.

Reading the super-secret documentation would help, I hope. ;-)

I realize that real programmers don't need (or look at) documentation, but 
it is impossible to convey everything important in Ada source code!

                               Randy.